Stuck in Lo Range 4WD. Suggestions?

36mm

2002 Chevrolet Suburban 1500 - Spindle And Axle Nuts

O'Reilly Auto Parts https://www.oreillyauto.com > cv--driveshaft---axle
Thread Size: M24-2.0 ; Hex Size (mm): 36mm.

Torque

https://www.google.com/search?q=2002+Chevy+Suburban+Z71.+axle+nut+torque

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Well it could be the selector switch, but I doubt it.
Generally, the service light means something is not working that the computer controls. Solenoids and valves are a couple of possibilities.
The transfer case is shifted by solenoids commanded by the body computer based on the switch position on the dash.
You should be able to have a shop scan the body computer for trouble codes and proceed from there.
A basic code reader may not access the body computer.

If all the lights are out then the 4wd switch is bad but,if it won't come out of 4wd-low then the 4wd actuator is bad or stuck.The 4wd actuator is what engages the differential from 2wd to 4wd.HOPE THIS HELPS!!!

With the engine running, transmission in neutral, foot on brake, push the 2wd button. If it doesn't respond, try the same thing with the engine off, key on. If it's still in lo range, you may have to get under the truck and shift the linkage manually. While you are under there, check the electrical connections and vacuum lines.

Try beginning with your car off. Start your car and put it in neutral with your foot on the brake. Then press any button besides 4-LO and 4-HI. This should take it out of 4-LO

did you try puting it in nutral then into 4wd, then back into 2wd?

Assume that is stuck in 4wd, cannot shift back to 2wd. Have you tried shifting to 4wd/Lo and back? Try letting out on the clutch while slowly rolling?

Assume you are manual transmission?

most likely needs an encoder motor. That is the fancy term for the motor that switches the t_case through the gears. The flashing lights indicate a code had been stored and you should have gotten it serviced then before further damage. as long as you dont drive it in 4 wheel you should still be ok

I have had maybe 9 Suburbans, over the years. Whenever I put in 4WD (whether Lo or Hi), I drive
normally. THEN, when DISENGAGING, I always drive the vehicle in REVERSE maybe 75 yards
AFTER placing in 2WD mode. Sometimes, still, on my '96 Suburban, --- even though the manual says NOT REQUIRED, it will "stick" in 4WD, UNLESS I take above action. Hope this might help.

we had this same problem, under the car there is a modular,near the transfer case, it just unlugs and plug a new one in.20 min.. it is approx. $80.00 item,$ 350.00 to have it done. we were in yellowstone when we had this problem. hope this helps